New Off-site Stormwater Quality Improvement Policy and updated Voluntary Payment
In Ipswich, the quality of stormwater running off some development sites after they’ve been constructed must be improved by meeting targets for reductions in stormwater pollutants. This often involves developers designing and constructing stormwater quality improvement devices on development sites (i.e., on-site) like raingardens, filter cartridge systems, and gross pollutant traps.
Since 2012, Ipswich City Council (council) has operated the Off-site Stormwater Quality Improvement Program (Program). The Program allows eligible developers to voluntarily pay fees to council instead of achieving some or all of the targets. Council uses these fees to deliver projects off development sites (i.e., off-site) that achieve an equal or greater reduction in stormwater pollutants relative to what developers would achieve on-site. These projects can involve designing and constructing stormwater quality improvement devices like bioretention basins, constructed wetlands, and passively irrigated and water smart street trees. They can also involve naturalising stormwater channels, re-engaging floodplains and wetlands, and stabilising and rehabilitating waterways. Council is committed to ensuring these projects provide multiple long-term economic, environmental, and social benefits to the Ipswich community in addition to meeting the off-site stormwater quality improvement responsibilities it takes on through the Program.
In late 2022, a review of the Program was undertaken which identified several issues that affected council’s ability to meet its off-site stormwater quality improvement responsibilities in an environmentally and financially sustainable way. The review recommended the following improvements to address the issues.
- The preparation of a new council policy to ensure consistent decision making in the Program in accordance with best practice stormwater management and the Queensland Government’s guidance for off-site stormwater quality improvement.
- The preparation of new guidelines that clearly outline eligibility, rules, and requirements for developers seeking to participate in the Program.
- An update to the unit and rate used to calculate fees paid by developers to recover council’s costs in planning and delivering off-site stormwater quality improvement projects and ensure environmental and financial risks are controlled.
In December 2024, council resolved to adopt the new policy and guidelines which can be found on Program’s website. The updated unit and rate will take effect from the 1st of July 2025 and will be included in the 2025-2026 Register of Fees and Charges. How and why the unit will be updated is described below.
Payment unit
To ensure consistent assessments of the off-site stormwater quality improvement responsibilities council takes on, and the performance of projects in meeting them, the current unit will change from square metres (m2) of water quality treatment area to kilograms (kg) of Total Nitrogen (TN) per year (kg/TN/year). The change of unit will result in the current rate of $1,121.23/m2 being updated to the equivalent value of $29,506/kgTN/year. Note that this does not represent an increase to the fee rate, and therefore the fees to be paid by developers, only a change in the unit used to measure responsibilities.
Payment rate
To address environmental modelling uncertainties and recover council’s costs for the operation of the Program, including the planning and delivery of projects to meet responsibilities, the updated fee rate will increase from $29,605/kgTN/year to $48,532/kgTN/year. This denotes a 64% increase in the fee rate, made up of a 50% increase to address modelling uncertainties and associated environmental and financial risks, and a 14% increase to recover council’s Program and project management costs.
The update to the unit and rate will maintain council’s position as a leader in off-site stormwater quality improvement in Queensland. This has been reflected in historic awards for off-site stormwater quality improvement projects (e.g., Small Creek channel naturalisation and Jim Donald Wetland) and most recently, the 2024 Award for Excellence in Policy and Education from Stormwater Queensland for the Program’s review.
For further information, please visit council’s Off-site Stormwater Quality Improvement Program website.